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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b538ac359522272bc5a637cf9411ea0a5c34b0a207f0e73a701331922e19d5d9' 
  AND token = 'cDDKe46eQS28X7fV/K9Was5J8jZPhc0QVNRj+4oCGB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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