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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bec1143dcd70bdbc652310e9cbdd352a5695aabdc80a32110036923e5eff621' 
  AND token = 'glTjwqDWnvgnOwKX+sKgZiJ+bFkwcqrcVeOcpq+7x9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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