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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a376fb672ef7784e0cf426f4aa109d04ec6995c595eb62ff9f466b75d72e071' 
  AND token = 'kOlzPmJIeMmOzoWkbg0vjCLE017VGz9WgzVo5tRX/LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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