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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a1a25ea775a22aa59bf4d5fab1145dcd92e5c8fb1a6b9f2efe64a2f95b5e6d' 
  AND token = 'TN9jiKDpg173wriY+G4Wl43API/fBCJXN0PtE8Er+DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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