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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4c3e9bfa780772b99332689a39f732ccde375913f4cd25059a3e1acb759b71' 
  AND token = 'RVcBSAenMF2USDjyW795vXiyBnl8Gkd7gUAKoN0usWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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