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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9e68a98f056f8e1d3a2b611b8e1f44ba84e21cf4a788d2cc324ec81ae333c9' 
  AND token = 'iaxH9eVmE+fP7tkNE98FK+Ng5Mrfy+MbYiNIOOyfP60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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