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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8361db007d2ad4af6758a464d6e62e93da5088a2e7a44b02c4e7db5953dca7ef' 
  AND token = 'S4zlLkfQqw86Qaj8KuD++VFl15UHrC2OkJaw5EqVpGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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