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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88680e68b7207de89d40886c5b8c4ddf649bca3b8a436d5136e90b21cb98f97' 
  AND token = 'AIokMCSEvM09X++XgjtUe/qqebBTAcyL+VoljVKaFZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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