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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8847f730d1ebfdb4bd227a173400682eaf100cf9fff50c80393f9671b6b46c8f' 
  AND token = '3IryplfXdoSzoQQhar1T8tq7ACaqY1npI/3GDiA+8l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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