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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c814078a480f44686ef6f10525e2465ce2c42bd104c94089b9ffc9b74800520c' 
  AND token = 'EkvNfbFufQy53mzdbEADqiLshOzX94I8qQnmoq0gImU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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