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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e215d68b0d99524ba9d5950c2f6582eee99d40858cb803874d582ae430ca81' 
  AND token = 'QPrClD9eJGZsO2Y6r2zAdjwvO8e836s332/HmGNqEDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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