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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbed2a4b167a492b5c79e8cb431acc889f16020da5c9bf592216c7d6e223aa62' 
  AND token = 'dJ0yVpL24RcepyAWC/3LPChLh2oAbAL6iUoeYl9Qww0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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