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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cf92e8e3ced8eb09a964810677b621c52e1cb1b6c34c2e5a3c5df4803eb442' 
  AND token = 'SP1+s6Lg0Fu0mJzJe4mYgJIicGVxYjKZFzyxOt5sQdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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