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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dc6cd392e9d793e373713fd1c9211ba729c5fb6334386dc0ef9cadb052013d' 
  AND token = 'ydAHaBK5NBQnxQOfDiCRqU9ByWZc7OPA4bUN+o7zpvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}