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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bab8b331a3d8cf1f9c9b760731032f272f9df1747729ed069d7859a456de7db' 
  AND token = 'VbnBHmLVlQpvqc86M9h2Q4+Mc6Oo5y2mNKBdpUimTC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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