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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c735aca175118119b31302f297c82bb24b7fdc523c90b816a9411f387d3a6b88' 
  AND token = 'xETJ54aXXFoEGKyL2U5GBhgKQ7jViLt4gt97IC1duMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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