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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e60399166d79eb177b9ba5d094e872babe07172209740d126748838d109ffbf' 
  AND token = 'OlmnH7W+MT+Gf5hAYnYPIlB9NRB1yqSh9BeX5HYM42s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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