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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08988b754452f079eb2851cdce8d4ba86544486d7eaca197168bbc9005c816a' 
  AND token = 'j6NYUiyh27HN81H8j9OckzHb8FM5E6jKxw6GapZnVoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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