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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b21f56b2fe5e4a8ab6786aad531b53370fe2e4eced92001640e2d6f206e8b3c' 
  AND token = 'ySSBT13kYki8pCpZatsOubU/fJ25UaSFxeoCH+CwrGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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