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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be4ea6165d4bd71745347e05606467a6381efde493b20d9b5c200b0ce899e64' 
  AND token = '/G62FeZ67XOzZ15KJ4+gjYlz+7lrLZ2e90hW2tAWvfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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