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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e21840181f42064b0e9d0b950bcc0181dd28107b8e6ec3b45449390a224347' 
  AND token = 'pk6YlkAP2MDKQ5HfP9fMtKdHLapypN4mHGGm6mLX594=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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