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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345be36a30d0a7624f397f47afc67e770690f1324a0a05834f4669b2781f8a37' 
  AND token = 'tjlNhsQuYbOcd25SwusZ0RqksB7OVB4coB5/Y0LFP9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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