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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c053b902e9ec415bc0e989bc6d037ca33f724578a6b2e6cd01288d7d57001e' 
  AND token = 'QYj9K9Fh9hwt+M1YlJLU09vD/sU+kkTIvo9CM5e+wKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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