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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6545a80f423efc780e934976df5b4eb2aaad6ca8bcc1a6a2c2b4691243dded' 
  AND token = 'QNx5jjfZB4Ap84qtAtXjSokPC2e90mb1Vus6g6kMHkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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