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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc304e7c37d92f7f3066dcdaa60b41968935ba3282d2d1a1595f1236a3ee9bd3' 
  AND token = 'lkZtiUD9g93F9AB70r5MYCrDAwQhm73oXRs6fAeXVSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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