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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d2ea11ea429adbfff7e7b64309322c5f6c63b0f9e59c7c490b8e43c688e404' 
  AND token = 'MuZQm8dAPc3tdR7n0ynlrNBB9/8wWnuHYnlRrCFXRzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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