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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17f3faf140750ba3092ceca718a5550da572cd6a002346294c3a0218511dafe' 
  AND token = 'XSwsTf4XDpL/0DeDxphgifQnZK8xLxzIRxt5Hslh07g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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