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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841e27599539818ad4a9d56c6084c7a829d8a091a0149a12843ef923b5a2427b' 
  AND token = '/NoeH3xsSseiONL82naTV8K6EOLhNZqOv+CJ5+Lawc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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