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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd129e92fe4e786ab7e99619417bd07f4718c8e063ed3d4d12b420777f2dcec89' 
  AND token = 'qfcZ8Z8QGFYv918n1rDPl/fDdIT6E/vn0j+/OpwdPns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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