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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c774a4eca765df43963b24bf773d7922ec9cb087dfe7d5090f7a68d5236d622' 
  AND token = 'vLd//3g6HGAzHD5AnjKIaDg+Y53rLzE8zaQe3gAe3pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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