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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d70664cfbab409eeade233dfb4715cb03d89376c759983a96e1e0d4b7064b4' 
  AND token = 'z1Oab3WSIhzXxFKmj0dBi8RTNrsSdvl389Q+FisBsPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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