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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c34ae0ba49e87e96e01fdab1e61ba5013ba37ad6ccafaedd7eba82e736252f' 
  AND token = '7y5elnlwZMh6XkOyVw7t2eTkfwGYUNGuB9zcERKsX/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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