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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7207296249a41c04595b02b7b55ee2323c6863f562dc95f4d623c1336ed6a5' 
  AND token = 'J4j5fDlyWm5Gyn0UTGVokMd4mrr8l2PEyay8wUsnTHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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