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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b03b13d82f50cba347cc32b39ea63315ee761aa9a96163b97b9409037760c9' 
  AND token = 'P/gDjd/EtzRYQBow9/Doq1PkuypVatzL/D9zVipivvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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