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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ce079684140f8c9a0946a80ad41de4f3e31b4ec92301829cd48beed2ca69cf' 
  AND token = 'VU0wDQWldDfFF+XodhFpQapgu1FLRorZ2HGakOIvOv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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