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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b615fa168d86bed3c933c0f8d90e3393d77664540b60cb27dbcc2999e949b130' 
  AND token = 'L8KTua8Hy4OfZ9nTC32sto451b6w2T2MPrcrdTdt+DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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