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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ef49dcaa43e786497d7763cea328309262adf5e8370c80979dc54dc2634cc1' 
  AND token = 'NPnOI9/pYc291p70oD/IgOxgF9TyIyE4Ck++158kfOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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