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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0eea398ffa9ab7c190d15143799193225b213ac5b80215c33ab14a05650325f' 
  AND token = 'WO+KwoAAPSeuey3tN4fB2XXvWV5cOgqX5X1NydLrrcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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