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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719c80e37dbbeba39d98776c67ca626e3e6a9455c43c867fe8ce7e13e93cd764' 
  AND token = 'ElZETtijwM9qz/3H5geluhQuI2clcbsFn3htZVUM7L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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