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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036768da4b738c5ec1934c949f54cd2a5bd6144db0b24c3e180fc31bd1eb9917' 
  AND token = 'lMzlvNqp1TgZwOZV4HGrl+0GIm+E8yymrymykew+j1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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