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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023307dd50f647d26467dbbba733dc7165e52e4f4127623852090637a6aec7a9' 
  AND token = 'zR4YSfHg9BwlHQtfacL6OqCHDdXnTaWrZ1JyCfdXHFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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