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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fc91097cfde1a535305eb80cf81f8deb518c810bc6b151b8c6101e62bb851e' 
  AND token = '0N7eMGBXDkd6/Fe8tON9xgIa0v/vpSgS8Y8R4Okfd4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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