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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088e3c0a997f5f995ce89626ee0253f811e854b28f2a08d59328a557282d3268' 
  AND token = 'GeGTdr0oFPQRQ0XBm/ynU0xBmXMit/5Po5U+BIcGIC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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