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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1761d1c2e4a6e544c0072bbf3f0d0490b178f6fc3e79e215ef1379cfe96470e' 
  AND token = 'WwMs4WoyEnqN46CKJuiKcPUGEiDtL8G3ju3FucoHY4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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