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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdec51e88c8223500fd0189d1fec8b1f444cb0484360f7bcd08c2a2a6eafd92' 
  AND token = 'tKeyB+0B2pNr/uI3FHouDW7+99OMA+q5Wl2PV9OSpdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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