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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06a8f1b88abad90c567c1def7a30b822b51d30f25c1e757db09ae6f957fe2ee' 
  AND token = '8MZhuHFR0eb3D/S5rumPG3TiseURGv/nIFkK4VG6jlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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