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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9a85a42cd7c2103cf416a1b931513aa384bd0736b72394b55555426a3b03b2' 
  AND token = 'FbmUNymrfNVPvlEF76qM+YUgvn4plseiWTKxtn0gV2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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