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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d3d6741601216f5e6458ead1c94eb156ba7c0cf9d00b767d9003c0b89814c6' 
  AND token = 'dZoZKFm/5/dCM+X4xE9lOwerTw/f9e6uS2/yv96WYso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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