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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba2ce839e49c8fff42d3f54f3ae4c53a9605600c6456454a8f89535cd73ba83' 
  AND token = 'iL2pFDkq+/sjqapcHdS5kkOdEnp08jfbYdtjsB2htQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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