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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12de36b550ac15731d5b7909050a3a76d1fb7d2d024b25be8404228d81eb2ce2' 
  AND token = 'FUTE57mZRHqkUtrXN/g3pHEZlLlmL8H9laR/2v/TW8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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