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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ccf7352bed235e5442af11c2ac5d3e17225f05043204dc06138dab5d344ede' 
  AND token = 'O0l/n9vs0rdrS4XNJws+Hx7FtrLb425OrStVIDiYwGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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