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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbcd14709bd4aa6a37b3248e5d1ddfd74dd827d21f1b0dfd52410878bf9ee9c' 
  AND token = 'yeh8vb50FM1PuWe0joKOHDlBgJRAUKWgbSH7Fc9Ph2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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