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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902966e3ef942b737dd53922da74e9789c2c72012c58c943fa2bdb427910bf1e' 
  AND token = 'In+ve5ewrwn+rfx+RCqBeaFRJzQZHm7L8+Nk2YBkksg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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