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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b252913a4591768c03adc8ca409f2f9e950cda28cc0d5b9d08fd99e0fac84510' 
  AND token = 'xAek3urrW9qT5YRUelGlqqEJKhVONgS3MyMZ6mjX9jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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